XXRRPP77660044 11AA 2299VV NNoonn--SSyynncc.. BBuucckk HHiigghh PPoowweerr LLEEDD DDrriivveerr March 2009 Rev. 1.0.0 GENERAL DESCRIPTION APPLICATIONS The XRP7604 is a non-synchronous voltage General Lighting and Displays mode PWM step down converter with Architectural and Accent Lighting integrated high side FET optimized to drive high power LEDs at up to 1A of continuous Medical and Industrial Instrumentation current. A wide 4.5V to 29V input voltage Video Projectors range allows for single supply operations from industry standard 5V, 12V or 24V power rails. FEATURES A 1.2MHz constant operating frequency allows for small external components selection while 1A Continous Output Current Capable an internal type II control loop compensation 4.5V to 29V Single Rail Input Voltage reduces the overall component count and solution footprint. A low 200mV feedback 1.2MHz Constant Switching Frequency reference voltage minimizes power dissipation Internal Control Loop Compensation in the system while efficiency is mazimized via a 100% duty cycle capability. Dimming and 0.2V Feedback Reference Voltage shutdown mode is provided via an enable 2.5% Output Voltage Accuracy function when required. An adjustable over current and under voltage lock out protection Built-in Soft Start insures safe operations under abnormal PWM & Analog Dimming Capability operating conditions. Adjustable Over-Current Protection The XRP7604 is pin compatible with Exars XRP7603 and SP7600, non synchronous buck Pin Compatible with 500mA rated high power led drivers respectively rated at XRP7603 & 2A rated SP7600 500mA and 2A. Thermally Enhanced Package The XRP7604 is offered in a compact thermally RoHS Compliant Green/Halogen Free enhanced RoHS compliant green/halogen 8-pin SO Package free 8-pin SO package. TYPICAL APPLICATION DIAGRAM Fig. 1: XRP7604 Application Diagram Exar Corporation www.exar.com 48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 XXRRPP77660044 11AA 2299VV NNoonn--SSyynncc.. BBuucckk HHiigghh PPoowweerr LLEEDD DDrriivveerr ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of Input Voltage Range V ................................4.5V to 29V IN the device at these ratings or any other above those Junction Temperature Range ....................-40C to 125C indicated in the operation sections of the specifications Thermal Resistance ...................................... 59C/W JA below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage.............................................-0.3V to 30V Lx................................................................-2V to 30V FB .....................................................-0.3V to V +0.3V IN Storage Temperature.............................. -65C to 150C Power Dissipation (Note 1) ................... Internally Limited Lead Temperature (Soldering, 10 sec) ...................300C ESD Rating (Lx, ISET)....................................1KV - HBM ESD Rating (All other pins) .............................2KV - HBM ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of T = 25C only limits applying over the full J Operating Junction Temperature range are denoted by a . Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T = 25C, and are provided for J reference purposes only. Unless otherwise indicated, V = 4.5V to 29V, C = 1F, T = 40C to 125C. IN IN J Parameter Min. Typ. Max. Units Conditions UVLO Turn-On Threshold 4.0 4.2 4.5 V 0C T 125C J UVLO Turn-Off Threshold 3.8 4.0 4.3 V 0C T 125C J UVLO Hysteresis 0.2 V Operating Input Voltage Range 4.5 29 V 0C T 125C J Operating Input Voltage Range 7 29 V Operating VCC Current 2 5 mA V =0.1V, not switching FB Standby VCC Current 0.6 1 mA V =1.2V, not switching FB Reference Voltage 200 mV Reference Voltage 186 200 214 mV Switching Frequency 960 1250 1550 kHz Minimum On-Pulse Duration 40 100 ns Minimum Duty Cycle 0 % Maximum Duty Cycle 100 % Measure V -V IN DR VDR Voltage 4.5 5.5 V V > 7V IN Over-Current Threshold 250 300 350 mV Measure V -Lx IN ISET Pin Input Current 25 33 40 A V =V IN Lx OFF Interval During Hiccup 100 ms SHDN Threshold 0.8 1.0 1.2 V Apply voltage to FB SHDN Threshold Hysteresis 100 mV Switch On Resistance 95 m Switch Leakage 3 5 A Note 1: All parameters tested at T =25C. Specifications over temperature are guaranteed by design. A 2009 Exar Corporation 2/13 Rev. 1.0.0